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Finding the Fourth Proportional to 28,521.40, 42,830.70 and 20,259.40

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Solution

The fourth proportional to 28,521.40, 42,830.70 and 20,259.40 is: 30,423.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,521.40 : 42,830.70 = 20,259.40 : x
  2. Step 2: Convert to fraction form
    28,521.40/42,830.70 = 20,259.40/x
  3. Step 3: Cross multiply
    28,521.40x = 42,830.70 × 20,259.40
  4. Step 4: Simplify right side
    28,521.40x = 867,724,283.58
  5. Step 5: Solve for x
    x = 867,724,283.58/28,521.40
  6. Step 6: Final answer
    x = 30,423.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.